Cobra Y173V - Dismounting Chart

21
4. DISASSEMBLING AND SERVICING
4-1-5 Gasoline Engine Is Overheat
TROUBLE
CAUSE
REMEDY
Gasoline Engine Is Overheat
Oil insufficient in the gasoline
Refill engine oil
Exhaust pipe blocked up
Clean exhaust pipe
Shroud leaking
Repair damaged part
Cooling fins blocked by foreign matter
Clear cooling fins
Connection rod deformation to make piston and cylinder
bushing side wear
Replace connection rod
Cylinder or piston or piston ring is worn to make hunting
between cylinder and crankcase
Replace the worn parts
Improper adjustment of engine governor to produce
speed high.
Readjust engine governor
Crankshaft main bearing burnt out
Replace main bearing
4-1-6 Abnormal Sound
TROUBLE
CAUSE
REMEDY
Beating sound
Piston, piston ring or cylinder is worn
Replace the worn part
Connection rod or piston pin and piston pin hole
are worn
Replace the worn part
Crankshaft main neck is worn
Replace bearing
Piston ring is broken
Replace piston ring
Metal beating sound
when abnormal
combustion occurs
Too much carbon deposit in combusting chamber
Clear away carbon deposit
Improper fuel brand
Replace fuel
Engine is overheat
Find a cause and eliminate it
The other
Improper valve clearance
Readjust valve clearance
properly
Fly wheel is not connected with crankshaft tightly
Connect tightly